the temperature measurement circuit Constituted by the microcomputer and others

Published:2011/5/18 1:56:00 Author: | Keyword: temperature measurement circuit, microcomputer , LM324, ADC0808 | From:SeekIC

Figure (b) shows the temperature and voltage conversion circuit.It is consist of Al-A4 operational amplifier LM324, VD2 regulator and VDl temperaturesensor and so on. By using the change of forward voltage of diode VDl's PN junction to the linear change of temperature, we converte the temperature to voltage.The work's power supply of the operational amplifier is generally positive and negative dual power.However, when the +5 V single power supply is working, we use LM324 which uses 士1·5V and circuit which uses A1 as midpoint voltage.ADCO808 uses the way of simulation to Connecte to midpoint voltage. The reference voltage is connected to ADC0808's V(REF)(+) port by the diode of 2v stable voltage VD2 which is through A2.



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